Use strict namespace behavior for mjs files. (#7545)

packages/babel-plugin-transform-modules-commonjs/test/fixtures/interop/imports-hoisting/output.js

@@ -1,5 +1,9 @@
-var _taggedTemplateLiteral = require("@babel/runtime/helpers/taggedTemplateLiteral");
+"use strict";
 
-var _templateObject = /*#__PURE__*/ _taggedTemplateLiteral(["foo"]);
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
+
+var _taggedTemplateLiteral2 = _interopRequireDefault(require("@babel/runtime/helpers/taggedTemplateLiteral"));
+
+var _templateObject = /*#__PURE__*/ (0, _taggedTemplateLiteral2.default)(["foo"]);
 
 tag(_templateObject);

packages/babel-plugin-transform-modules-commonjs/test/fixtures/interop/options.json

@@ -1,3 +1,4 @@
 {
+  "sourceType": "module",
   "plugins": ["external-helpers", "transform-modules-commonjs"]
 }